onCancel transition update deviceEntryIconParentViewAlpha to onFinished alpha

If the transition is cancelled, the next transition that starts will
start from the end state of the cancelled transition.

Also update deviceEntryBackgroundViewAlpha to the onFinished alpha
onCancel.

Fixes: 350192819
Flag: EXEMPT bugfix
Test: atest AodToLockscreenTransitionViewModelTest LockscreenToOccludedTransitionViewModelTest
Change-Id: Iea55edb4bf203910c9356adff7b36bf65a222d1a